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Signing and Pushing TorizonCore Packages to Torizon Platform Services

Introduction

The Torizon Platform Services allows customers to push their own customized versions of TorizonCore (OS updates) and Docker Compose (application updates) to our hosted service. It means that, after customizing an image or creating your application, you must sign and push it to Torizon Platform Services.

In this article, you will learn how to use the TorizonCore Builder Tool for signing and pushing packages to the Torizon Platform Services.

This is a feature available on prime-tiers of the Torizon Platform Services. If you want to learn more about the Torizon Platform Services pricing and plans, please contact us. Request access to evaluate the Torizon Platform Services premium features

This article complies with the Typographic Conventions for Torizon Documentation.

Prerequisites

The prerequisites to complete these instructions are:

• A host machine with TorizonCore Builder installed.
• A .tar file containing the TorizonCore Image with no-container pre-provisioned for offline installation.
• A credentials.zip file downloaded from your account on the Torizon Platform Services dashboard.
• A docker-compose file of your appplication container if you want to update your application.

Make sure your working directory has the following structure, including credentials.zip, docker-compose.yml, and the TorizonCore installation image torizoncore-image-tezi-format:

$ tree
.
├── credentials.zip
├── torizoncore-image-tezi-format.tar
└── docker-compose.yml

Also make sure you can run TorizonCore Builder:

$ torizoncore-builder --help

Generating a TorizonCore image

Our TorizonCore Builder tool is the recommended way to customize a TorizonCore OS image to suit your product requirements. This tool allows easy customization of nearly all aspects of the OS, and for a more detailed evaluation at its features please take a look at TorizonCore Builder Tool - Customizing TorizonCore Images.

With TorizonCore Builder, you will always generate OS images that are suitable to be pushed to our Torizon Platform Services for updates.

The output of this process is either an OSTree reference or a Toradex Easy Installer compatible image - ready to be installed with Toradex Easy Installer (TEZI), usually during production programming.

• Using standalone commands: the deploy command generates a TEZI format image, while the union command generates an OStree branch.
• Using the build command, you can set the output section of the configuration file for either options.

info

If you want to deploy simultaneously the OS and application with Torizon Platform Services, you should use the synchronous update feature of our Torizon Platform, instead of customizing your image to bundle containers to a TorizonCore image, since its bundled containers are not capable of being deployed without Toradex Easy Installer.

Signing and Pushing the Image to Torizon Platform Services

The TorizonCore Builder tool will also be used to push your OS image and your application to the server.

The command platform push from TorizonCore Builder can be used to push a new TorizonCore image to Torizon Platform Services.

torizoncore-builder platform push --credentials <credentials file> <ostree reference>

The command requires the credentials.zip file from Torizon Platform Services and a reference to the OSTree repository that should be pushed to the Platform Services server.

If you are pushing Toradex Easy Installer compatible images, first you should run the images unpack command to generate a base OStree reference.

$ torizoncore-builder images unpack <base Toradex Easy Installer image of Torizon>

After running the images unpack command, you should use base as the ostree reference.

As an example, the command below will push the customized and unpacked image to Torizon Platform Services:

torizoncore-builder platform push --credentials credentials.zip base

Now, if you log in to Torizon Platform Services and initiate an update, you should see the customized image, ready to be used to update a device:

And, if everything went fine with the update, you shall see your board rebooting when the process is completed, and the splash screen shown in the device initialization will be the one defined in the new image.

There are also some additional arguments that can be passed to further customize this image update package.

torizoncore-builder platform push --credentials <credentials file> --package-name <name for this image update> --package-version <version for this image update> <ostree reference> --hardwareid <supported hardware for this image update>

The --package-name argument will apply whatever is passed as the name for this image update package. Simply put, this is the name that your update will appear under in our Torizon Platform Services web UI. However, this argument is optional and, if not used, will default to the OSTree reference.

The --package-version argument is the version that this image update package will show up as in the web UI. This doesn't have to be a numerical version and can be any legitimate string. This argument is optional, and if not used, the version will default to the OSTree subject.

The --hardwareid argument defines which hardware IDs the image to be uploaded will be compatible with. This argument can be repeated multiple times, adding extra supported hardware IDs to the image. It's important to notice this argument will override the default image's hardware ID. Under the Supported Hardware tab at the Torizon Platform Services web UI, you can confirm the changes. This argument is optional, and if not used, the supported hardware ID will default to the original image's hardware ID.

Signing and pushing the docker-compose file to Torizon Platform Services

The command platform push can also be used to push docker-compose files to Torizon Platform Services.

For this credentials.zip is also required along with the path to the docker-compose file. Your compose file can have any name, as long as it ends in .yml, or .yaml. If it does not have either of these file endings then the command will assume you passed an OSTree reference instead.

torizoncore-builder platform push --credentials <credentials file> <path to docker-compose file>

There are also some additional arguments that can be passed to further customize this update package

torizoncore-builder platform push --credentials <credentials file> --package-name <name for this update> --package-version <version for this update> --canonicalize <path to docker-compose file>

The --package-name argument will apply whatever is passed as the name for this updated package. Simply put, this is the name that your update will appear under in our Torizon Platform Services web UI. However, this argument is optional and, if not used, will default to the pushed file's name.

The --package-version argument is the version that this package will show up as in the web UI. This doesn't have to be a numerical version and can be any legitimate string. This argument is also optional and, if not used, will default to the date of upload at UTC time in the format of yyyy-mm-dd.

The --canonicalize argument generates a canonicalized version of the docker-compose file, changing its extension to '.lock.yml' or '.lock.yaml' before pushing it to Torizon Platform Services. If no other package name is provided, using the --package-name argument, the default package name will be the generated file's name when using the canonicalize argument.

info

For a docker-compose file to be suitable for use with offline updates it must be in canonical form.

If a name for the package is explicitly specified with --package-name, then it should also end with .lock.yml or .lock.yaml. Moreover, due to some known limitations, the package name must only employ basic ASCII characters excluding control ones and those in the set \/:*?"><|, otherwise the Lockbox generation may fail later.

For example running the following command:

torizoncore-builder platform push --credentials credentials.zip --package-name tcb-test --package-version 1.1 docker-compose.yml

Will result in the following appearing in your account's web UI:

Lockfiles and Canonical Docker Compose Files

When pushing a docker-compose file to Torizon Platform Services, TorizonCore Builder will:

• Canonicalize the docker-compose file
• Save a copy of the canonicalized docker-compose file with .lock.yml or .lock.yaml extension (depending on how you named your docker-compose file)
• If the --canonicalize option was provided, send the canonicalized docker-compose file to Torizon Platform Services.

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Canonicalizing a docker-compose file basically means putting it into a specific YAML format, removing comments (lines starting with a # or any word included after a # character), and associating HASH values to Docker images.

This way, it would be easier to track changes to this docker-compose file and also make your deployment more secure since we are pulling down images based on HASHES instead of tags.

Setting Package Compatibility on Docker Compose Files

When pushing a docker-compose file to Torizon Platform Services, you can set the package compatibility using the --compatible-with argument.

This argument accepts the OS package hash and restricts an application package so it can only be installed with a compatible OS package.

torizoncore-builder platform push --compatible-with sha256=<OS package hash> --credentials <credentials file> <path to docker-compose file>

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The OS package Hash can be found by inspecting the OS package on your Platform account. The OS package must be accessible on your Platform account.

Once the Docker Compose file is added to your Platform account, you can inspect its compatibilities in the compatibilities section when clicking on the Docker Compose Package.

To edit the Package compatibility on a Docker Compose file in the platform, use the Configure Compatibilities section: